A google search for “fritzing part srd-o5” (the part number of the relay) turns up a variety of sources. Some are no longer available, but several are (there are a couple of posts here in the forum that may be suitable.) As well there is one in a project which can be obtained by going to
and right clicking to download the .fzz file. Load that in to Fritzing and in the temp parts bin is the relay part (which can be exported by right clicking on it and choosing export part.)
Peter